๐๐ต๐ฎ๐ฝ๐๐ฒ๐ฟ ๐ฒ: Program Control Instructions Flashcards
Allows the programmer to skip sections of a program and branch to any part of the memory for the next instruction.
Jump
Allows the programmer to make decisions based upon numeric tests
Conditional Jump
Is a 2-byte instruction that allows jumps or branches to memory locations within +127 and โ128 bytes from the address following the jump.
Short Jump
a 3-byte instruction that allows a branch or jump within ยฑ32K bytes (or anywhere in the current code segment) from the instruction in the current code segment.
Near Jump
A 5-byte instruction that allows a jump to any memory location within the real memory system
Far Jump
Short and near jumps are often called as __________ jumps.
Intrasegment
Far jumps are often called as __________ jumps.
Intersegment
are called relative jumps because they can be moved, along with
their related software, to any location in the current code segment without a change
Short Jump
also called displacement, follows the opcode
distance
A symbolic name for a memory address
Label
Is similar to the short jump, except that the distance is farther
Near Jump
in 0200 R, the letter R denotes -
Relocatable Jump Address
Obtains a new segment and offset address to accomplish the jump
Far Jump
Another way to obtain a far jump is to define a label as a ______
Far Label
Appear in programs that contain more than one program file
External Labels
This symbol defines a label as global
double colon (LABEL::)
The address of the
jump is in the register specified by the jump instruction.
Indirect Jump
indirect jump
indirect jump
double-indirect jump
Instructions that set a byte to either 01H or clear a byte to 00H, depending on the outcome of the condition under test
Conditional Set
is a combination of a decrement CX and the JNZ conditional jump
Loop
.command
dot commands
Directive that causes all assembler generated statements to be listed, including the label @Startup generated by the .STARTUP
directive
.LISTALL
is used with a condition to begin the loop, and the .ENDW statement ends the loop
.WHILE statement
is often followed by the .IF statement to select the break
condition
.BREAK
Can be used to allow the DOโ.WHILE loop to continue if a certain condition is met
.CONTINUE
A series of instructions is
repeated until some condition occurs
REPEAT-UNTIL
is a group of instructions that usually performs one task
Procedure
is a reusable section of the software that is stored in memory once, but used as often as necessary
Procedure
instruction that links to the procedure
CALL
instruction that return from the procedure
RET
pushes the address of the instruction
CALL
removes an address from the stack so the program returns to the instruction following the CALL.
RET
transfers the flow of the program to the procedure
CALL
is like a far jump because it can call a procedure stored in any memory location in the system
Far Call
removes a 16-bit number
Near return
removes a 32-bit number
Far Return
is either a hardware-generated CALL or a software-generated CALL
Interrupt
externally derived from a hardware signal
hardware-generated CALL
internally derived from the execution of an instruction or by some other internal event
software-generated CALL
is a 4-byte number stored in the first 1024 bytes of the memory when the microprocessor operates in the real mode
Interrupt Vector
How many different interrupt vectors
256
At times, an internal interrupt is called a/n __________
exception
Either type interrupts the program by calling a/n ________
interrupt service procedure (ISP)
Is used only with software or hardware interrupt service procedures
Interrupt Return (IRET)
is a special software interrupt designed to function as a breakpoint
INT 3
is a conditional software interrupt that tests the overflow flag
INTO
Places a 1 into the I flag bit, which enables the INTR pin
Set Interrupt Flag (STI)
Places a 0 into the I flag bit, which disables the INTR pin.
Clear Interrupt Flag
Propagates the carry or borrow in multiple-word/doubleword addition and subtraction
Carry Flag
Monitors the hardware BUSY pin on the 80286 and 80386, and the TEST pin on the 8086/8088
WAIT
Stops the execution of software
Halt (HLT)
When the microprocessor encounters this instruction, it takes a short time to execute
No Operation (NOP)
appends an instruction and causes the LOCK pin to become a logic 0
Lock Prefix
passes instructions to the floating-point coprocessor from the
microprocessor
Escape (ESC)
first made available in the 80186 microprocessor, is a comparison
instruction that may cause an interrupt
BOUND
first made available to the 80186 microprocessor, are used
with stack frames, which are mechanisms used to pass parameters to a procedure through the
stack memory
ENTER and LEAVE
